TiO_(2)作用下土霉素的可见光敏化降解  

Photosensitized Degradation of Oxytetracycline under Visible Light Irradiation Inpresence of TiO_(2)

作　　者：田琳 刘义青 付永胜 TIAN Lin;LIU Yiqing;FU Yongsheng(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都611756

出　　处：《水处理技术》2022年第9期83-87,共5页Technology of Water Treatment

基　　金：四川省科技厅应用基础研究项目(2021YJ0385)。

摘　　要：研究了二氧化钛(TiO_(2))存在时土霉素(OTC)在可见光下的降解。结果表明:单独可见光照下,OTC的光解效率随着pH的升高而逐渐增大。可见光和TiO_(2)的联合能显著促进OTC的降解,这主要归因于OTC的自光敏化作用。淬灭实验表明,在可见光/TiO_(2)体系中,超氧阴离子自由基(O_(2)^(•−))和羟基自由基(•OH)能够氧化降解OTC,且O_(2)^(•−)是主要的活性物种。OTC初始浓度会影响其在可见光/TiO_(2)体系中的降解,过高或过低的OTC浓度都不利于其自身的去除;但是TiO_(2)用量的增加却能逐渐提高OTC的降解效率。The degradation of oxytetracycline(OTC)under visible light irradiation in the presence of titania(TiO_(2))was investigated in this paper.The results showed that the photolysis efficiency of OTC increased gradually with increasing pH under visible light alone irradiation.The combination of visible light and TiO_(2)could significantly enhance OTC degradation,which was mainly attributed to the self-photosensitization of OTC.According to the results of scavenging experiments,superoxide radical(O_(2)^(•−)) and hydroxyl radical(·OH)could oxidatively degrade OTC and O_(2)^(•−) was the dominant reactive species for OTC removal in visible light/TiO_(2)system.The initial OTC concentration could affect its degradation in visible light/TiO_(2)system and too high or too low OTC concentration was not beneficial to its own removal.However,the degradation efficiency of OTC improved with the increase on TiO_(2)dosage.

关 键 词：土霉素 可见光 二氧化钛 光敏化 活性氧物种 

分 类 号：X703.1[环境科学与工程—环境工程]